// JavaScript Document

function getWeekNr()
{
	var today = new Date();
	Year = takeYear(today);
	Month = today.getMonth();
	Day = today.getDate();
	now = Date.UTC(Year,Month,Day+1,0,0,0,0);
	var Firstday = new Date();
	Firstday.setYear(Year);
	Firstday.setMonth(0);
	Firstday.setDate(1);
	then = Date.UTC(Year,0,1,0,0,0,0);
	var Compensation = Firstday.getDay();
	if(Compensation > 3 ) Compensation -= 4;
	else Compensation +=3;
	NumberOfWeek = Math.round((((now-then)/86400000)+Compensation)/7);
	return NumberOfWeek;
}
	
function takeYear(theDate)
{
	x = theDate.getYear();
	var y = x %100;
	y+=(y<38)?2000:1900;
	return y;
}

function weeknumbertjes()
{
	var weeknumber = getWeekNr();
	var today = new Date();
	if(today.getDay() == 0) weeknumber = getWeekNr() - 1;
	document.getElementById('frametje').src="dezeweek/"+ weeknumber +".htm";
}